package utilities;

import java.io.File;

import javax.swing.filechooser.FileFilter;

public class MyFilter extends FileFilter {
	@Override
	public boolean accept(File f) {
		if (f.isDirectory())
			return true;

		String extension = getExtension(f);
		if (extension != null)
			return extension.equals("txt");
		else
			return false;
	}

	@Override
	public String getDescription() {
		return "Ficheiros de dados";
	}

	/*
	 * Get the extension of a file.
	 */
	public String getExtension(File f) {
		String ext = null;
		String s = f.getName();
		int i = s.lastIndexOf('.');

		if (i > 0 && i < s.length() - 1) {
			ext = s.substring(i + 1).toLowerCase();
		}
		return ext;
	}

}